Hybrid metallic-dielectric grating
First Claim
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1. A grating, comprising:
- a base layer comprising material that reflects electromagnetic radiation, wherein said base layer comprises metal; and
layers of dielectric material of varying refractive index, wherein a bottom interface of said layers is adherent to said base layer, wherein said layers are periodically spaced on top of said base layer, wherein said base layer is not covered by said layers in regions, wherein said grating comprises at least one Bragg plane.
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Abstract
A diffraction grating includes a metallic base layer and layers of dielectric materials of varying refractive index, where a bottom interface of the layers is adherent to the metallic base layer. The dielectric layers are periodically spaced on top of the metallic base layer, leaving the metallic base layer exposed in regions. This grating allows for the polarization insensitive reflective properties of the base metallic layer to operate in conjunction with the polarization sensitive diffraction properties of the multilayer grating structure to provide near 100% diffraction efficiency over a reasonable wavelength bandwidth, independent of the polarization of the incident beam.
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Citations
24 Claims
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1. A grating, comprising:
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a base layer comprising material that reflects electromagnetic radiation, wherein said base layer comprises metal; and
layers of dielectric material of varying refractive index, wherein a bottom interface of said layers is adherent to said base layer, wherein said layers are periodically spaced on top of said base layer, wherein said base layer is not covered by said layers in regions, wherein said grating comprises at least one Bragg plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A grating, comprising:
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a base layer comprising material that reflects electromagnetic radiation; and
layers of dielectric material of varying refractive index, wherein a bottom interface of said layers is adherent to said base layer, wherein said layers are periodically spaced on toy of said base layer, wherein said base layer is not covered by said layers in regions wherein said grating comprises at least one Bragg plane, wherein said base layer comprises a metal blank having a polished surface.
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12. A grating, comprising:
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a base layer comprising material that reflects electromagnetic radiation, and layers of dielectric material of varying refractive index, wherein a bottom interface of said layers is adherent to said base layer, wherein said layers are periodically spaced on top of said base layer, wherein said base layer is not covered by said layers in regions, wherein said grating comprises at least one Bragg plane, wherein said layers have a protective layer of about a half-wave thickness for one of the Bragg planes of the grating.
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13. A method for fabricating a grating, comprising:
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providing a base layer comprising material that reflects electromagnetic radiation, wherein said base layer comprises metal; and
adhering layers of dielectric material of varying refractive index, wherein a bottom interface of said layers is adherent to said base layer, wherein said layers are periodically spaced on top of said base layer, wherein said base layer is not covered by said layers in regions, wherein said grating comprises at least one Bragg plane. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for fabricating a grating, comprising:
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providing a base layer comprising material that reflects electromagnetic radiation; and
adhering layers of dielectric material of varying refractive index, wherein a bottom interface of said layers is adherent to said base layer, wherein said layers are periodically spaced on top of said base layer, wherein said base layer is not covered by said layers in regions, wherein said grating comprises at least one Bragg plane, wherein said base layer comprises a metal blank having a polished surface.
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24. A method for fabricating a grating, comprising:
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providing a base layer comprising material that reflects electromagnetic radiation; and
adhering layers of dielectric material of varying refractive index, wherein a bottom interface of said layers is adherent to said base layer, wherein said layers are periodically spaced on toy of said base layer, wherein said base layer is not covered by said layers in regions, wherein said grating comprises at least one Brags plane, wherein said layers have a protective layer of about a half-wave thickness for one of the Bragg planes of the grating.
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Specification